In a strict detoxification setting, it's not likely that they will start you on a new, long-term medication. Generally they are just there to get you medically stable and that's going to include things like benzodiazepines (taper), clonidine, etc. We have a place here in Vermont called the Brattleboro Retreat, which is pretty well-known as facilities go and they combine the detox with a model of inducing psychiatric care to be continued outside of the facility. This isn't the case with most detox's, but I don't think it's out of the question to request something like an SSRI from the physician while you're there, especially if it will contribute to keeping you from relapsing and coming back.